Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bukhari:6252Ibn Bashhār > Yaḥyá > ʿUbaydullāh > Saʿīd from his father > Abū Hurayrah

The Prophet ﷺ said (in the above narration No. 268), "And then raise your head till you feel at ease while sitting. "  

البخاري:٦٢٥٢حَدَّثَنَا ابْنُ بَشَّارٍ قَالَ حَدَّثَنِي يَحْيَى عَنْ عُبَيْدِ اللَّهِ حَدَّثَنِي سَعِيدٌ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ النَّبِيُّ ﷺ ثُمَّ ارْفَعْ حَتَّى تَطْمَئِنَّ جَالِسًا